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Why does my computer keep shutting down on its own?

Answer

Random computer shutdowns are caused by either an overheating processor or a failure in the operating system. Fixing your operating system's registry fixes many random shutdown issues. For a potentially overheating processor, verify that your computer's fan is spinning at a consistent rate and that it is free from dust.Registry errors are caused by installing, uninstalling and removing software from your computer. Some pieces of software overrule others, causing conflicts in how the system is told to operate. Running a registry cleaner fixes these inconsistencies, preventing registry errors from causing random shutdowns. Take care to back up your registry as-is, however, just in case the software breaks the functionality of some of your programs. Not all registry cleaners are created equal, and many others are paired with dubious promises. For overheating issues, check to make sure that the fan is clean, spins freely and varies its RPMs with the workload and internal temperature of your computer. Your computer's task manager reports the internal temperature of your computer. The more open and running programs, the higher the temperature gets. Remove your computer case, and verify that the interior is clean. Do not use canned air to clean the fan and heat-sink areas. This forces dirt and dust into the sensitive areas of the computer. Instead, use a vacuum hose with a narrow nozzle, taking care not to disturb or touch any of the internal components.
Q&A Related to "Why does my computer keep shutting down on its..."
if your computer runs for a while then shuts down, this is often a lack of power to the system. Try removing anything you can live without (modem card if you use ethernet, soundcard
http://wiki.answers.com/Q/Why_your_computer_shutti...
1. Check for BIOS updates on the laptop manufacturer's website. 2. Check for operating-system updates. 3. Make sure that there aren't any obstructions to the air vents. These will
http://www.ehow.com/how_6809012_troubleshoot-shuts...
Here is how to FLASH your system http://www.gigabyte-usa.com/MotherBoard/Support/BIOS/HowToReflash/HowToReflash_1.htm Since your machine is shutting down on you.. BEFORE you apply
http://www.experts-exchange.com/Virus_and_Spyware/...
It's possible there is a short in one of the wires for the switches (self-shorting is how the motherboard knows to power on/off or reset, so if there's a problem in the wire that
http://answers.yahoo.com/question/index?qid=201108...
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